US6963719B2 - Thin walled fuser roll with strengthened keyway - Google Patents
Thin walled fuser roll with strengthened keyway Download PDFInfo
- Publication number
- US6963719B2 US6963719B2 US10/736,961 US73696103A US6963719B2 US 6963719 B2 US6963719 B2 US 6963719B2 US 73696103 A US73696103 A US 73696103A US 6963719 B2 US6963719 B2 US 6963719B2
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- US
- United States
- Prior art keywords
- thin
- fuser roll
- keyway
- core cylinder
- roll assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
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- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 12
- 238000005728 strengthening Methods 0.000 claims abstract description 11
- 238000005336 cracking Methods 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007639 printing Methods 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
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- 108091008695 photoreceptors Proteins 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
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Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2053—Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
Definitions
- Fuser rolls used in electrostatographic imaging systems generally comprise a metal core cylinder coated with one or more elastomer layers.
- Conventional fuser roll core cylinders are relatively thick walled aluminum alloy cylinders. Such thickness has been desired in order to provide strength and durability as the fuser roll presses against the nip of the adjoining compression roll.
- a thickness of 5.5 mm is fairly standard. Similar dimensions are common in office and production printing systems capable of imaging more than 50 pages per minute.
- One drawback to such relative thickness is that thicker walls make the cylinder more massive. Since a typical fuser must attain a fusing temperature of approximately 150° C., significant power and time are required to heat and maintain the fuser at fusing temperatures. For conventional fuser cores of about 5.5 mm thickness, warm-up time lasts from about 7 to about 30 minutes.
- drive gear 11 forms a sleeve 12 that slips over core cylinder 10 in the manner shown.
- Key pin 15 protrudes inwardly from sleeve 12 to engage slot 12 .
- drive gear 11 together with sleeve 12 , is generally made of rigid plastic. Such plastic has a different co-efficient of expansion than the metal of cylinder 10 .
- the metal of cylinder 10 would expand at a rate greater than the plastic of drive gear 11 during fusing and thereby create undesirable looseness between drive gear 11 and cylinder 10 .
- a thin-walled fuser roll assembly of the present invention is a thin-walled fuser roll assembly, comprising: a metallic core cylinder having a wall thickness between about 0.5 millimeters and about 2.0 millimeters, an end region, and having an axial and a radial direction; a drive gear having an internal diameter sleeve for fitting over an end of the core cylinder and a key for forcing rotation of the core cylinder; a keyway in the end region of the core cylinder for receiving the drive gear key; and a means for providing strength to the core cylinder wall proximate to the keyway sufficient to prevent cracking from repeated cyclic compression.
- FIG. 1 Another embodiment of the present invention is an electrostatographic imaging system, comprising: a thin-walled fuser roll assembly, comprising: a metallic core cylinder having a wall thickness between about 0.5 millimeters and about 2.0 millimeters, an end region, and having an axial and a radial direction; a drive gear having an internal diameter sleeve for fitting over an end of the core cylinder and a key for forcing rotation of the core cylinder; a keyway in the end region of the core cylinder for receiving the drive gear key; and a means for providing strength to the core cylinder wall proximate to the keyway sufficient to prevent cracking from repeated cyclic compression.
- a thin-walled fuser roll assembly comprising: a metallic core cylinder having a wall thickness between about 0.5 millimeters and about 2.0 millimeters, an end region, and having an axial and a radial direction; a drive gear having an internal diameter sleeve for fitting over an end of the core cylinder and a key for
- Yet another embodiment of the present invention is a process for fusing toner to a copy sheet, comprising: for a period less than about one (1) minute, pre-heating a thin-walled fuser roll comprising core cylinder walls between about 0.5 millimeters and about 2.0 millimeters thick wherein a strengthening means supplements the strength of the thin walls proximate to a keyway formed in the core cylinder; moving a copy sheet into engagement with a nip formed by the fuser roll and a pressure roll; and driving rotation of the fuser roll with a drive gear having an internal diameter sleeve fitting over an end of the core cylinder and a key for engaging the keyway of the core cylinder, thereby moving the paper through the nip.
- FIG. 1 is a perspective view of thin-walled fuser roll core cylinder assembly showing the failure mode of such an assembly without the strengthening of the present invention.
- FIG. 2 is a cross-sectional end view of a thin walled fuser roll core cylinder pressed by a pressure roll.
- FIG. 3 is a perspective view of a fuser roll core cylinder having a pressed key way for added strength.
- FIG. 4 is a perspective view of a fuser roll core cylinder assembly having a keyhole and a pushable pin on the drive gear.
- FIG. 5 is a perspective view of a fuser roll core assembly having a reinforcement member to strengthen the thin cylinder walls.
- An exemplary electronic system comprising one embodiment of the present invention is a multifunctional printer with print, copy, scan, and fax services.
- Such multifunctional printers are well known in the art and may comprise print engines based upon ink jet, electrophotography, and other imaging devices.
- the general principles of electrophotographic imaging are well known to many skilled in the art. Generally, the process of electrophotographic reproduction is initiated by substantially uniformly charging a photoreceptive member, followed by exposing a light image of an original document thereon. Exposing the charged photoreceptive member to a light image discharges a photoconductive surface layer in areas corresponding to non-image areas in the original document, while maintaining the charge on image areas for creating an electrostatic latent image of the original document on the photoreceptive member.
- This latent image is subsequently developed into a visible image by a process in which a charged developing material is deposited onto the photoconductive surface layer, such that the developing material is attracted to the charged image areas on the photoreceptive member. Thereafter, the developing material is transferred from the photoreceptive member to a copy sheet or some other image support substrate to which the image may be permanently affixed for producing a reproduction of the original document. Permanent fixation generally is accomplished by fusing the developing material, or toner, to the support substrate using heat and pressure. Fuser rolls of the present invention are used in this process. In a final step in the process, the photoconductive surface layer of the photoreceptive member is cleaned to remove any residual developing material therefrom, in preparation for successive imaging cycles.
- the above described electrophotographic reproduction process is well known and is useful for both digital copying and printing as well as for light lens copying from an original.
- the process described above operates to form a latent image on an imaging member by discharge of the charge in locations in which photons from a lens, laser, or LED strike the photoreceptor.
- Such printing processes typically develop toner on the discharged area, known as DAD, or “write black” systems.
- Light lens generated image systems typically develop toner on the charged areas, known as CAD, or “write white” systems.
- Embodiments of the present invention apply to both DAD and CAD systems. Since electrophotographic imaging technology is so well known, further description is not necessary. See, for reference, e.g., U.S. Pat. No. 6,069,624 issued to Dash, et al. and U.S. Pat. No. 5,687,297 issued to Coonan et al., both of which are hereby incorporated herein by reference.
- FIG. 1 The failure mode of a thin-walled fuser core cylinder with a conventional drive slot is shown in FIG. 1 .
- cylinder core 10 has a wall thickness substantially less than the standard 5.5 mm thickness. Wall thicknesses from about 0.5 mm to about 2.0 mm result in substantially shorter warm-up times and substantial improvements in energy efficiency. The thinner the wall, the shorter the warm-up and the greater the energy efficiency. Pre-heating warm-up times less than about 1 one minute is desirable and less than about 30 seconds is preferred. Testing indicated that a wall thickness of about 1.1 mm was adequate for fuser rolls having an outside diameter of about 35.0 mm. Such fuser rolls are typically used in electrostatographic imaging systems capable of printing more than 50 pages per minute. However, as shown in FIG. 1 , cracks, such as crack 11 , developed from the base of keyway slot 14 in as few as 30,000 copies. Expected life for such fuser rolls is intended to last at least 400,000 copies.
- FIG. 3 One solution to strengthening the walls of a core cylinder is shown in FIG. 3 .
- cylinder 20 is shown with a slotless keyway 24 pressed into the wall of cylinder 20 .
- Keyway 24 is sized to accept key 15 shown in FIG. 1 .
- Core cylinder 20 may accordingly be driven by drive gear 11 in the same manner as cylinder 10 shown in FIG. 1 .
- cylinder 20 has a wall thickness of only from about 0.5 mm to about 2.0 mm and preferably about 1.1 mm thick.
- the advantages of fast warm-up time and energy efficiency are accordingly essentially the same as with cylinder 10 , i.e., about 1 minute or less and perferably about 30 seconds or less.
- FIG. 4 Another embodiment of the present invention is shown in FIG. 4 .
- keyway slot 14 from FIG. 1 is replaced by through hole 34 .
- Sleeve 12 is extended outward from gear 11 , and key 35 comprises a movable pin.
- pin 35 has a flanged top in order to prevent pin 35 from slipping through the hole in sleeve 32 and into the center of cylinder 30 .
- pin 35 is pressed into keyhole 34 .
- key 35 is able to drive cylinder 30 and that the end region of cylinder 30 remains comparatively resistant to cyclical compression since the end region comprises a full cylinder but for relatively small hole 34 .
- FIG. 5 Yet another embodiment is shown in FIG. 5 .
- a reinforcement member such as ring 46 is mounted proximately to the inside or outside of core cylinder 40 proximate to the terminus of keyway slot 44 .
- ring 46 was affixed to cylinder 40 prior to machining of slot 44 , and slot 44 has been machined into a portion of ring 46 .
- Another variation is a ring located on the outside of cylinder 40 such that when cylinder 40 is heated to fusing temperatures, cyclinder 40 expands and is compressed by the ring proximate to the keyway terminus. Although compressed, cyclic compression is avoided since the cylinder at the terminus remains under constant compression. The result of the variations exemplified in FIG.
- a reinforcement member such ring 46 can be affixed while the sheet lies flat. As the sheet is bent into a cylinder, then the reinforcement member is also bent.
- a reinforcement member need not be a complete ring. Reinforcement may be adequate if segments are only placed proximate to slot 44 or proximate to slot 44 and opposite such slot. Cyclic compression is not believed as great a problem during the portions of the cylinder's revolution when the slot is proximate to the pressure roll or opposite the pressure roll.
- the thin-walled core fuser cylinder assembly of the present invention includes thin walls plus means for strengthening these thin walls in the end region adjacent to the drive gear and its sleeve.
- the present invention permits faster warm-up times and improved energy efficiency while providing sufficient strength in the end region to prevent cracking caused by cyclic stress.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
Claims (26)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/736,961 US6963719B2 (en) | 2003-12-16 | 2003-12-16 | Thin walled fuser roll with strengthened keyway |
CA002489846A CA2489846C (en) | 2003-12-16 | 2004-12-09 | Thin walled fuser roll with strengthened keyway |
JP2004363146A JP4721694B2 (en) | 2003-12-16 | 2004-12-15 | Thin fixing roll assembly with reinforced keyway, image forming system and toner fixing process comprising the same |
BR0405681-7A BRPI0405681A (en) | 2003-12-16 | 2004-12-15 | Thin-wall fuser roll with reinforced keyway |
CNB2004101011601A CN100444046C (en) | 2003-12-16 | 2004-12-16 | Thin walled fuser roll with strengthened keyway |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/736,961 US6963719B2 (en) | 2003-12-16 | 2003-12-16 | Thin walled fuser roll with strengthened keyway |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050129435A1 US20050129435A1 (en) | 2005-06-16 |
US6963719B2 true US6963719B2 (en) | 2005-11-08 |
Family
ID=34653988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/736,961 Expired - Fee Related US6963719B2 (en) | 2003-12-16 | 2003-12-16 | Thin walled fuser roll with strengthened keyway |
Country Status (5)
Country | Link |
---|---|
US (1) | US6963719B2 (en) |
JP (1) | JP4721694B2 (en) |
CN (1) | CN100444046C (en) |
BR (1) | BRPI0405681A (en) |
CA (1) | CA2489846C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040253026A1 (en) * | 2003-06-11 | 2004-12-16 | Samsung Electronics Co., Ltd. | Image forming apparatus |
US20060024098A1 (en) * | 2004-07-29 | 2006-02-02 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
US20060159489A1 (en) * | 2004-11-22 | 2006-07-20 | Kunihiko Ishii | Belt driving apparatus |
US7127203B1 (en) * | 2005-09-06 | 2006-10-24 | Xerox Corporation | Fuser member with reinforced slot |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100705324B1 (en) * | 2005-11-02 | 2007-04-09 | 삼성전자주식회사 | Heater of Fusing Unit |
JP2009122563A (en) * | 2007-11-19 | 2009-06-04 | Ricoh Co Ltd | Fixing device and image forming apparatus |
CN102193427B (en) * | 2010-03-18 | 2014-03-26 | 株式会社理光 | Fuser roller mechanism, fusing device and image formation device |
JP5915310B2 (en) | 2012-03-26 | 2016-05-11 | 富士ゼロックス株式会社 | Fixing device and image forming apparatus |
JP6111464B2 (en) * | 2014-10-31 | 2017-04-12 | コニカミノルタ株式会社 | Belt drive device and image forming apparatus |
JP5819014B1 (en) * | 2015-01-29 | 2015-11-18 | ミツマ技研株式会社 | Heat roll fixing device and heat roller |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5687297A (en) | 1995-06-29 | 1997-11-11 | Xerox Corporation | Multifunctional apparatus for appearance tuning and resolution reconstruction of digital images |
US6069624A (en) | 1998-03-02 | 2000-05-30 | Xerox Corporation | Message management system for a user interface of a multifunctional printing system |
US6393248B1 (en) * | 1999-11-12 | 2002-05-21 | Hitachi Koki Co., Ltd. | Fixing device of image forming apparatus and fixing roller |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0744048A (en) * | 1993-07-29 | 1995-02-14 | Toray Ind Inc | Driving gear for thermal fixing roller for copying machine |
JP3821503B2 (en) * | 1995-01-11 | 2006-09-13 | 住友電気工業株式会社 | Fixing roller and manufacturing method thereof |
JPH09127810A (en) * | 1995-10-27 | 1997-05-16 | Minolta Co Ltd | Fixing device by induction heating |
JP3407513B2 (en) * | 1995-12-06 | 2003-05-19 | 富士ゼロックス株式会社 | Image forming device |
JPH09281834A (en) * | 1996-04-19 | 1997-10-31 | Ricoh Co Ltd | Fixing roller |
JPH10111615A (en) * | 1996-10-04 | 1998-04-28 | Ricoh Co Ltd | Hollow roller state member |
JP3498938B2 (en) * | 1997-05-09 | 2004-02-23 | 株式会社リコー | Heating roller support device, fixing device, electrophotographic device |
JP3440773B2 (en) * | 1997-07-16 | 2003-08-25 | 富士ゼロックス株式会社 | Fixing device |
JP3795770B2 (en) * | 2000-06-30 | 2006-07-12 | 株式会社リコー | Fixing apparatus and image forming apparatus |
-
2003
- 2003-12-16 US US10/736,961 patent/US6963719B2/en not_active Expired - Fee Related
-
2004
- 2004-12-09 CA CA002489846A patent/CA2489846C/en not_active Expired - Fee Related
- 2004-12-15 JP JP2004363146A patent/JP4721694B2/en not_active Expired - Fee Related
- 2004-12-15 BR BR0405681-7A patent/BRPI0405681A/en not_active IP Right Cessation
- 2004-12-16 CN CNB2004101011601A patent/CN100444046C/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5687297A (en) | 1995-06-29 | 1997-11-11 | Xerox Corporation | Multifunctional apparatus for appearance tuning and resolution reconstruction of digital images |
US6069624A (en) | 1998-03-02 | 2000-05-30 | Xerox Corporation | Message management system for a user interface of a multifunctional printing system |
US6393248B1 (en) * | 1999-11-12 | 2002-05-21 | Hitachi Koki Co., Ltd. | Fixing device of image forming apparatus and fixing roller |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040253026A1 (en) * | 2003-06-11 | 2004-12-16 | Samsung Electronics Co., Ltd. | Image forming apparatus |
US7133637B2 (en) * | 2003-06-11 | 2006-11-07 | Samsung Electronics Co., Ltd. | Heat roller assembly for image forming apparatus |
US20060024098A1 (en) * | 2004-07-29 | 2006-02-02 | Brother Kogyo Kabushiki Kaisha | Image forming apparatus |
US7369806B2 (en) * | 2004-07-29 | 2008-05-06 | Brother Kogyo Kabushiki Kaisha | Engagement method and system for an image forming apparatus |
US20060159489A1 (en) * | 2004-11-22 | 2006-07-20 | Kunihiko Ishii | Belt driving apparatus |
US7245857B2 (en) * | 2004-11-22 | 2007-07-17 | Kyocera Mita Corporation | Belt driving apparatus |
US20070223978A1 (en) * | 2004-11-22 | 2007-09-27 | Kunihiko Ishii | Belt Driving apparatus |
US7643782B2 (en) | 2004-11-22 | 2010-01-05 | Kyocera Mita Corporation | Belt driving apparatus |
US7127203B1 (en) * | 2005-09-06 | 2006-10-24 | Xerox Corporation | Fuser member with reinforced slot |
Also Published As
Publication number | Publication date |
---|---|
JP4721694B2 (en) | 2011-07-13 |
CA2489846C (en) | 2008-07-08 |
CA2489846A1 (en) | 2005-06-16 |
JP2005182023A (en) | 2005-07-07 |
CN1629739A (en) | 2005-06-22 |
US20050129435A1 (en) | 2005-06-16 |
BRPI0405681A (en) | 2005-08-30 |
CN100444046C (en) | 2008-12-17 |
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